The Golgi tendon organ is a receptor organ that gives the body information about the force that a muscle is developing as it contracts.
The structure is also known as the Golgi organ, neurotendinous organ, or neurotendinous spindle.
It is found at the junction of muscle fibers with a tendon. It consists of fibers of collagen, which are stretched by the movement of the muscle, and is supplied with a sensory nerve that carries impulses to the central nervous system. This information (feedback) is used in spinal reflexes and in co-ordination of movement by skeletal muscles.